研究目的
To prepare oxygen deficient PbTiO3-d ceramics by solid state-reaction method and investigate their structural, dielectric, and magnetic properties, with a focus on the role of oxygen vacancies in inducing multiferroic character.
研究成果
Oxygen deficient PbTiO3-d ceramics with pure perovskite phase were successfully prepared at 800°C/2h calcination. Structural characterization confirmed tetragonal symmetry and oxygen vacancies. Dielectric properties showed high permittivity and losses due to oxygen vacancies, with homogeneous distribution. Weak ferromagnetism was induced, attributed to oxygen vacancies and surface effects, suggesting potential multiferroic character. Future work should focus on increasing ferromagnetic properties for applications.
研究不足
The study is limited to room temperature measurements; temperature-dependent properties were not investigated. The weak ferromagnetism observed may not be sufficient for practical multiferroic applications, and further optimization is needed to enhance magnetic properties. The sample calcined at 750°C was not available for Raman measurement due to cracking.
1：Experimental Design and Method Selection:
The study used solid state-reaction method to prepare PbTiO3-d ceramics, with calcination at various temperatures to optimize phase formation. Theoretical models included Jonscher law for conductivity analysis.
2：Sample Selection and Data Sources:
Commercial raw materials PbO and Ti3O5 of high purity were used. Samples were calcined at 650°C, 700°C, 750°C, and 800°C for 2h in a high vacuum furnace.
3：List of Experimental Equipment and Materials:
Agate mortar for mixing, high vacuum furnace for calcination, PANalytical Empyrean X-ray diffractometer for XRD, Burker Vertex 70 FTIR Spectrometer for IR, LABRAM HR-800 micro-Raman Spectrometer for Raman, JEOL JSPM 5200 SEM with EDX for microstructure and composition, Solartron 1260A Impedance Analyzer for dielectric measurements, MICROSENSE EV9 VSM for magnetic measurements.
4：Experimental Procedures and Operational Workflow:
Powders were mixed in agate mortar with ethyl alcohol, pressed into pellets, calcined at specified temperatures, and characterized using XRD, IR, Raman, SEM/EDX, impedance, and VSM measurements at room temperature.
5：Data Analysis Methods:
XRD data analyzed with HighScore database software, IR and Raman spectra interpreted for vibrational modes, impedance data fitted to Jonscher law, magnetic data analyzed for hysteresis loops.
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